A Tableau Workbook file contains content formatted using XML-based specifications. Tableau Workbook files are created by users with Tableau Desktop software. The TWB file extension is for a Tableau Workbook File. Tableau Desktop by Tableau Software works with TWB files. TWB files are data files, not documents or media meant for viewing.
TWB files are specific to Tableau Desktop, a data analysis and visualization application. These files contain code in XML markup. TWB files store data, dimensions, measures, visualizations like graphs and charts, plus references to imported data sources. Tableau Software workbooks save states of data analyses and visualizations.
When double-clicked to open, if Windows does not recognize the TWB extension, it cannot open the file. No default application is associated with TWB files. However Tableau Desktop and Software are the recommended way to manage the .twb file type.
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Tableau Desktop